Hello, English is not my mother tongue, so please excuse me, but do you want to get a milling spindle or a lathe? Because I don't understand.
Hi, I am a new user and dont wanna crash wrong thread, so hope you can help me.
I am on a vertical mill build, and as I know it will take me a year or two, I break it down in pieces, and after I solved how to reball the cheap linear sliders (hgr 20 hiwin clone) and while I wait for balls for the rolled screws, I am working on the spindle and assy.
Sherline is too expensive, so my way is to buy a r8 to morse adapter, mtb 2 or 3 for drawbar and machine the item to fit minimum 2, 32904 roller bearings or a better config (2 angular in the bottom and 1 radial in top, under the belt drive).
I will post pictures as soon as I find out how to, but please tell me what thread I should use, as I dont want to mess anything up here in your soo informative forum that I respect and like so much.
Cheers Mike.
Sorry for my bad English..maybe string is more precise than thread...
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Hello, English is not my mother tongue, so please excuse me, but do you want to get a milling spindle or a lathe? Because I don't understand.
I am making both as I need lower revs (max 5000rpm) for milling steel, and my lathe could also use a new spindle. The only difference is that the milling head use mtb and the lathe will use morse taper A.
The reason I go for morse taper, is that it is the cheapest way to have a toolholder (I dont need atc).
An ER-collet is not indexable, and morse is the cheapest toolholder I know of..
Here is the adapter I will use. It has a m12 in the rear end, and the drawbar for mk2B is 10mm, so need a little creativity :-)
The bearings is on order, and I will post more as items arrive.
Dear Mactec, please note I write it is an R8 to mk2b adapter, it even says so on the label in the picture. The r8 will be where the bearing goes... and then I will use the mk2 in the other end to mount ... mk2 toolholders :-)
I might or might not use the hollow M12 bolt in conjunction with the drawbar mechanism..
This is all about beeing cheap, and satisfy my needs for a cheap toolholder. The total cost for the spindle with bearings and drawbar should be less than 50 usd..
Last edited by Mikeedd; 09-30-2020 at 12:53 PM.
I do not have an R8 spindle, please read my text, Mac.. I am building a spindle with this adapter, and have choosen morse taper as toolholder, due to the low price. I know many better toolholder options, as the NT30 and so on, but the price is very high.
You are very right about the "stick out" and I am working on a design where the bearings is placed as close to the end with the morse taper.
I will post a drawing shortly, to avoid further misunderstandings :-)
Yes, nice linear shaft, but not an indexable toolholder really?
Mine is more lathe-work, but keyway is premade, and needed as it is geared 1:10 from high speed 500w, also very cheap and aircooled DC- motor :-)
I would be very happy if you know how to balance the unit :-)
Last edited by Mikeedd; 10-01-2020 at 07:29 PM.
Indexable means that I just jam this in the spindle taper, when I need an ER32 toolholder, so I dont have to zero my tool more than the first time I use it :-)
For the milling head, it is mt2b, and for the lathe maybe mt2a, but the mill need the drawbar, and I will show later, but now it is time to wait, for the items to arrive....
Please note the price is 6usd, plus 8usd in transport...
Nasty, but cheap, aint it :-)
Or theese toolholders, and there are many on the net, for a couple of dollars, and they will all fit very snug in my spindle, made from a modified r8 to mt2b adapter :-)
Last edited by Mikeedd; 10-02-2020 at 03:53 PM.
Mactec54
I want repeatability, also when I change my tools, thats why I will use a toolholder system.
As I use cheap chineese clones, I will have to modify all components to suit, as nothing is free. After fixing the linear guides, Im working on the ballscrews now, and It is a lot of work, but a part of the game when you take the cheap route.
I also need to make a system for balancing the spindle and mounted toolholders, so will have a lot of fun the next couple of years to come :-)
I think the taper roller bearings 320/22x from SKF is fine, as max speed is aprox 15krev/min and rollers are very strong, what is needed in this tiny diameter spindle.
I have to admit, i doubt the project, and allready bought a mk3 spindle, as the mk2 is quite small, but will give it a try anyway as it is cheap.
Please be patient, as the Corona, mainly target the mailmen, as I understand..I think they have to walk from China, as 60-90 days delivery time now happens...
Good day to all of you lovely folks :-)
Mactec54
It looks super Mactec, and I would love a 30T but my tools are not up to that for now.
I have read your build tread for the ER spindle build, and you make very fine work :-)